单选题 Before being able to sojourn to Europe, many preparations such as vaccinations and visas are required.
【正确答案】 A
【答案解析】[解析] 句意：在前往欧洲逗留之前，很多准备工作诸如注射疫苗和申请签证都是必不可少的。sojourn逗留，旅居。stay briefly是对sojourn的正确解释。enter进入。depart离开。be bound for前往，到……地方。